Ralph s



B.- S. BONILLA.

COMBINATION LATCH LOCK.

APPLICATION FILED lL[LY I2. I919.

1,325,346. Patented D e0. 16,1919.

UNITED STATES PATENT orrion RALPH S. BONILLA, OF NEW YORK, N. Y., ASSIGNOR OF ONE HALF TO PIERRE H.-

WEBBER, OF NEW YORK, N. Y.

COMBINATION LATCH-LOCK.

Specification of Letters Patent.

Patented Dec. 16, 1919.

Application filed July 12, 1919. sens-rm. $111465.

The object of the invention is to provide a. latch having such construction and arrange ment of parts as to afford means for locking the latch in closed position of a door so that the latch can not be unlocked from the inside or the outside without using a key upon the outside of the latch.

A further object of the invention is to pro vide, in a combined latch and look, a de-' vice or member loosely mounted on one of the latch stems and slidable lengthwise such stem by the roll back for locking and unlocking the latch.

A still further object of the invention is to provide a latch stem extension havin a sto or shoulder and a headed end, an a locking member slidable on the extension between the stop and the head by key movement of a roll back for locking and unlocking the latch. 7

Various other objects, advantages and improved results are attainable in the manufacture and practical application of the invention, as will be hereinafter pointed out in the specification.

Various devices have been provided for locking and unlocking such latches by operating the latch knob in connection with latch bolts, but I have devised means for preventing the movement of such knobs when in locked position of the latch, except by using a key, first to unlock the latch and alien to retract the latch bolts for opening-a oor.

In the accompanying drawings forming part of this application:

Figure 1 is a perspective view of the interior of the latch as projected and in unlocked position, and showing the inner side of the covering plate with the roll back as in unlocked position.

Fig. 2 is a plan view with the covering plate partly .broken away showing the roll back in unlocked position.

Fig. 3 is a similar view partly broken away showing the parts as in locked position.

Fig. 4 is a cross section of'the latch as applied to a door with a key in position.

Fig. 5 is a detail perspective viewof the latch bolt and its stems without springs and showing the locking dog or member on'one of said stems.

Figs. 6 and 7 are perspective views showin a modified looking member, and a modifieid stop respectively.

Fig. 8 is a similarview of further modification.

The same reference characters denote the same parts throughout the several views of the drawings.

In carrying out my invention, I employ an'ordinary night-latch casing 1 having the usual hand knob 2 the hub 3 of which has a plate 2* secured thereto having lateral wings 1 and 5 for working the stems 6 and 7 of the latch bolt, said stems working through,

the usual cross head 8 and are provided with spiral springs 9 between said head and the latch bolt which abuts against a sto 10 to "limit the inward movement of the ,olt as usual. The usual cap plate 11 or covering for the inner face of the casing 1 is employed,"and has a slotted hub 12 swiveled thereon for a key-operated stem 13 projecting from the tumbler casing 14. A roll back 15 is secured to the hub 12 on the inner face of the plate cover 11 which is secured in place upon lugs 16 of the casing 1, by means of a set screw fitting the screw threaded post 17 in the usual way. The roll back comprises a thin plate having an arm 18 provided with parallel side edges for engaging a locking dog or member 19, hereinafter more particularly referred to.

In order to accommodate the locking member 19, I make the stem 6 longer than the stem 7 to provide an extension 20 preferably of smal er diameter than the stem 6 so as to form a shoulder 21 therebetween which forms an abutment for themember 19 loosely slidable on said extension 20. Another or opposite abutment for the member 19'is formed by the head 22 of the stem extension 20, and said head has a forwardly projecting strike plate 23, the forward end of which is opposite or in the same plane with a strike plate 2% secured to the end of the stem 7 The strike plates are engaged by the wings 4: and 5 for operating the latch either by the knob or by a key when the latch bolt is unlocked as shown in Figs. 1 and 2 of the drawings, where it will be seen that the roll back arm 18 is forward of the locking member 19, and the latch bolt is free to be operated as above stated, but when it is desired to lock with the said bolt in projecting position, the key is turned 'forward or toward the said bolt one revolution,

, which reverses the position of the roll back arm 18 to the opposite side of the locking member 19 and holds the latter against the stem shoulder 21, so that there can be no movement of the latch bolt while the mem ber 19 is held against the said'shoulder by the arm 18, without reversing the arm 18 by a reverse movement of the key. Obviously the key is withdrawn while the parts are in the position last described and as shown in Fig. 3 of the drawings, so as to leave the latch permanently and securely locked both from the inside and the outside of a room or compartment until the key is again applied,

It will be seen that in order to lock the latch after a door is closed and latched, it is only necessary to give the key one reverse revolution forwardly and remove the key, where the latch is left with all its parts'in locked position, to the preclusion of opening the door from the inside by the usual turning of the knob, as the latter is also locked by the said locking mechanism against movement.

ihe locking dog or member 19 may be of any desired or necessary shape for various latches to loosely fit the stem extension for sliding movement thereon without interfering with the other mechanism, and the roll back should be so mounted asto be revolved by the key from one side to the other of said locking member, and in lieu of the member 19, a collar 25 may be used on the stem 25,

or a pin 26 may extend through the stem 27.

so as to form a stop for the member 19.. These modifications are shown in Figs. 6 and 7, respectively, andin 8 is shown another form of the locking dog 28 having a circular head 29 and roll back contact faces 30 and 31.

I do not wish to be understood as limiting the invention as to shape, size and material, nor to the length of travel provided for the locking dog, neither do I wish to confine the invention to any particular latch to which my invention is found applicable, but reserve the right to make such changes and variations therein and in the application thereof as may be found expedient in recast-e the manufacture and practical application of the invention within the scope of the appended claims.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is --1. In a spring latch, a latch bolt, a pair of bolt stems of unequal length, a key-operated roll back on the back of the latch, a knob-operated roll back on the front of the latch, and a bolt locking device mounted on the longer stem and operated by the roll back for sliding and holding said device so as to lock the bolt against operation by the knob roll back.

2. In a spring latch, a latch bolt, a loosely slidable bolt-locking member mounted on said bolt,a roll back for said bolt reversibly mounted and operated by a key, for sliding and holding said member in bolt locking position so that said bolt can not be operated from the inside of a door.

3. ln a latch of the character described, a latch bolt, a pair of spring controlled bolt stems one of which is longer than the other, a bolt locking member loosely mounted on the said longer stem, and a roll back operated by a key from the outside of a door for sliding and holding said member in looking position so that the bolt can not be re-' tracted to unlocked position from the inside of the door.

4:. In a look, a latch bolt, a bolt stem hav- I ing an extension, a bolt looking dog slidable on said extension, and a roll back mounted on the inner face of the back of the lock and operated only by a key for sliding and holding the bolt in locked position so as to prevent unlocking from the inside of a door.

5. In a lock, a latch bolt, a bolt stem having a stop, a bolt locking memberslidable on said stem, an inner cap plate forming the back of the lock, and a key operated roll back on the inner face of said plate for sliding and holding the said member against the stop, whereby the bolt is locked in extended shoulder, a locking dog slidable on the extension, and a key-operated roll back turnable against the do so as to slide and hold the dog against said shoulder for locking the bolt and preventing unlocking from the opposite side of the lock,

7. A locking device for latch locks, co1nprising a key-operated roll back revolubly mounted on the inner face of the back of the look, a latch bolt having a stem, and a locking dog loose upon the stem and slidably engaged and held by the roll back for locking the latch, said roll back adapted to be given reverse movement only by a key for releasing the do to unlock the latch.

, 8.,A locking evice for latch locks, comprising a key-hub on the back of the lock,

a roll back secured to the hub and revoluble on the inner face of said back by a key only,

a latch bolt, a pair of bolt stems, and a 5 locking dog loosely mounted on one of the bolt stems for holding said bolt in extended and locked position.

9. In a spring latch, a latch bolt, a knob roll back for said bolt, a bolt-locking mem- 10 her slidable on said bolt, and a key-operated roll back for engaging the said member so as to dog the latch bolt against operation by the knob roll back. I

In witness whereof I hereunto set my hand in the presence of two Witnesses;

RALPH s BONILLA.

Witnesses:

ELIAS ISAACS, JOSEPH MANTELLE. 

